Upper respiratory is in contact with the air we breathe -air is contaminate with microorganisms. Inspite of pathogenic bacteria in the upper respiratory tract, the rate of inf…ection is minimized by microbial antagonism. Which is certain microorganisms of the normal microbiota that suppress the growth of other microorganisms through competition for nutrients and the production of inhibitory substances. (MORE)

an active hostility or opposition, as between unfriendly orconflicting groups: the antagonism between the liberal and theconservative parties. .
2. an opposing force , pri…nciple, or tendency: Her plan to becomean actress met with the antagonism of her family. .
3. Physiology . an opposing action, as by one muscle in relationto another..
4. Biochemistry, Pharmacology . the opposing action ofsubstances, as drugs, that when taken together decreasethe effectiveness of at least one of them ( contrasted with synergism )..
5. Ecology . a. a relationship between two species of organisms in which the individuals of each species adversely affectthe other, as in competition..
b. the inhibition of the growth of one type of organism by adifferent type that is competing for the same ecological. (MORE)

Antagonism is typically the result of conflicting entities such as two arguing opponents or competing individuals or teams and or disagreement between two enemies and even fri…ends and teammates. (MORE)